Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Changes in Estimated Fair Value of Level 3 Financial Liabilities (Details)

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Fair Value Measurements - Summary of Changes in Estimated Fair Value of Level 3 Financial Liabilities (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance $ 10,464 [1]
Ending balance 3,532
Warrant Liabilities [Member]  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance 10,464
Decrease in estimated fair value of contingent warrant liabilities upon revaluation (6,932)
Ending balance $ 3,532
[1] The condensed consolidated balance sheet as of December 31, 2015 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015.